Manager Brendan Rodgers told the club's website: "Jordan is someone who represents the best values of what we are all about, as a team and as a club.
"Both he and Steven are examples to others in how they conduct themselves on and off the pitch. It's how they live their lives, it's how they train and it's how they approach their work.
"For club and country he holds himself really well, he's got great stature and I believe he will be an important player here for years to come."
Henderson joined Liverpool from Sunderland in 2011.